. >> most important for the regime is creating a new cult of personalities around this man kim jong-un his father's third son and heir to the kingdom about him little is known. >> we don't even know how old he is. north korea hasn't released his birth date. we assume he's in his late 20s. but that's never been confirmed. >> he is believed to have studied in switzerland. we are not sure. >> what is known is he now commends xhands the world's 4th largest army with 1.1 million soldiers and a nuclear arsenal with 6 bombs. though the population of 22 million act with blind devotion to their new leader some people inside the country are beginning to show unprecedented dissent. >> he had the exodus of north korean country. >> the new under ground railroad is a network of safe houses and secret routes helping north koreans get out. this is extremely dangerous among christian missionaries who work with north koreans. >> in a fox files exclusive we tracked down one man who risked everything to escape with his family. >> how scared were you when you were crossing that border? >> i knew that in or